num_bands

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“Most of these models are BS[band-split]/Mel-Band Roformer. [It] can be distinguished by their config, BS uses `freqs_per_bands`, Mel-Band uses `num_bands`”

So you most likely installed this model with wrong model type chosen during installation of the model. Go to Edit model config and set it to Mel-Roformer instead of BS-Roformer (or the opposite) and the non-V2 one.